Ionization of metal clusters by ions in the Fermi velocity range |
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Authors: | PG Reinhard E Suraud CA Ullrich |
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Institution: | Institut für Theoretische Physik, Universit?t Erlangen, Staudtstr. 7, 91058 Erlangen, Germany, DE Laboratoire de Physique Quantique, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France, FR Department of Physics, University of Missouri, Columbia, Missouri 65211, USA, US
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Abstract: | We simulate excitation of metal clusters by highly charged, energetic ions, analyzing electron emission in terms of discrete
ionization probabilities. Our test case is the collision of on the cluster at velocities around the electronic Fermi velocity of bulk sodium. The calculations are performed with a density-functional
approach, using the time-dependent local density approximation. We find that ionization takes place on an extremely short
time scale of less than 5 fs. The preferred final charge state depends sensitively on the impact parameter. High ionization
can easily be achieved in sufficiently close collisions. Direct trapping through the by-passing ion is found to be of little
importance at the velocities considered.
Received: 28 July 1997 / Received in final form: 23 December 1997 / Accepted: 8 January 1998 |
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Keywords: | PACS 36 40 Cg Electronic and magnetic properties of clusters[:AND:] 36 40 Wa Charged clusters - 36 40 Gk Plasma and collective effects in clusters |
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